ASoC: Fix compile warning in wm8750.c

sound/soc/codecs/wm8750.c:784:2: warning: missing braces around initializer
sound/soc/codecs/wm8750.c:784:2: warning: (near initialization for ‘wm8750_spi_ids[2].name’)

It's because struct spi_device_id.name is a char array, not a pointer,
while the driver initializes explicitly with 0.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/soc/codecs/wm8750.c

@@ -781,7 +781,7 @@ static int __devexit wm8750_spi_remove(struct spi_device *spi)
 static const struct spi_device_id wm8750_spi_ids[] = {
 	{ "wm8750", 0 },
 	{ "wm8987", 0 },
-	{ 0, 0 },
+	{ },
 };
 MODULE_DEVICE_TABLE(spi, wm8750_spi_ids);